Concept
Trends Overview
The function of a trend log is to log the variable that it is connected to and store the records.
To be able to store larger amount of records, you connect an extended trend log. The records of the trend log and the extended trend log can be presented numerically in a trend log list or graphically in a trend chart. The records can also be processed by a calculation method before they are presented.
A trend log that monitors an enumeration records the enumeration value and not the enumeration definition.
For more information, see Event and Alarm Enumerations .
For more information, see Trend Log Enumerations .
During the logging process, activity in the server may be temporarily increased. This is because a second polling rate is applied to each variable 30 seconds before the logging time. With multiple logs, the increase in activity can be significant. After 30 seconds, when a value is logged, the polling rate is set to the maximum integer.
Trend Log Types
You use a trend log to collect data and then store the records. A record contains a log value or an event as well as its time stamp and an optional comment. A trend log can log an analog variable, a digital variable, or an integer variable.
For more information, see Trend Log Types .
Trend Log Functions
All trend logs store records by using the circular storing principle; you can also connect trends logs to external trend logs with larger storing capacity. For some trend logs you can set up conditions that have to be fulfilled before the trend log starts recording.
For more information, see Trend Log Functions .
Trend Units
You can define the unit of a trend log when the trend log is created or on a previously created trend log where no unit has been set.
For more information, see Trend Units .
Trend Charts
A trend chart displays the records of a trend log or an extended trend log as a series.
For more information, see Trend Charts .
Trend Log Lists
The trend log list numerically displays the records of a trend log or an extended trend log. The records of the trend log can be processed by a calculation method before they are presented in the trend log list.
For more information, see Trend Log Lists .
Multi Trend Log Lists
You configure a multi trend log list to display values from multiple trend logs in one list. You compare values in a multi trend log list when you commission or validate an EcoStruxure BMS.
For more information, see Multi Trend Log Lists .
Move or Copy Trend Logs or Extended Trend Logs
When moving or copying a trend log or extended trend log to another EcoStruxure BMS server, only the configuration of the trend log is transferred. If you copy the trend log to another EcoStruxure BMS server, all recorded values are preserved in the original trend log while the copy on the other EcoStruxure BMS server does not contain any recorded values. If you move the trend log to another EcoStruxure BMS server, the configuration of the trend log is preserved but the record values are lost.
Mass Create
You use the mass create feature to create multiple identical alarms or trend logs for different objects, instead of creating the alarms or trend logs one by one. From trend logs, you can mass create extended trend logs.
For more information, see Mass Create .
Function Overview
Trend Log Types
Event and Alarm Enumerations
Trend Log Enumerations
Trend Log Functions
Trend Units
Trend Log Lists
Trend Charts
Multi Trend Log Lists
Mass Create